Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb76a94520f1afdc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 01:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1624dcbaa0e3cceef601e25839f47214 SHA-1: 850a8b83d01b87928b549e8258e27045ee4426c6 SHA-256: eb76a94520f1afdc6364a6b070fc48b4d4a5f3bc6531d6bdd41a05fb190f70f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites. This structure suggests the document is intended to act as a link farm, potentially for phishing or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=electrical+system+design+handbook+pdf PDF link annotation
    • http://sportschoolindex.nl/images/uploads/rowepopureluxepuz.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/08874f1956e8897733a2c67567634504/duwuzavaronexegofakakezo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3cb2cab5---47157601797.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160871477cf307---23880631232.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/56366938579.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/323c6nl53amqbtrg3mb21c1c2h/teparafipaxoloxenibijijo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/99134862339.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/13033151c3ee30e67816c56a96c9c46c/wuvutixuwogativekeje.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7hq28k2aagl58fdcs3apk3tpo4/gititekuxukapa.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/guxenexinasij.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c314ab8d4---rijafofoxelozupomodikupuj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe52e61906---sefegafidasuwifigexojut.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/140853465e24a9ddf3045af2c5f0a691/35360997999.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pedazesidoxave.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/ketew.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/sunokufoveberujisoseb.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/jebekopesosidajumafovibu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d035d01a14a---85829077601.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/31246814838.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db6a1b35f34---93847625875.pdfIn PDF document text
    • http://0930actress.com/files/files/xalurodadol.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210701044739_686536350.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/j524aplc1mo6o7gcsegk6c4h6g/momuzipatofexotivun.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773551ed514---kifawemowufugurejafuba.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e766069f2c---kozivaditizoximomupapubor.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9ad658485b056d37dcec7ceae70086a0/31920554959.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 11396 bytes
SHA-256: 7fd539d2a4c769d77d7e63ab3ecb1510e6080d5181012190c103728f13baf8a7
font_01_sfnt_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 15964 bytes
SHA-256: 2109e8cebfb88bf17ab3620a5a3a778c76c4b490a092a8cd79961be5f23041eb

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